寒冬内置相变石蜡结构塑料大棚光热环境研究

Study on the Light and Heat Environment of Plastic Greenhouse With Built-in Phase Change Paraffin Structure in Cold Winter

以透明玻璃封装相变储能材料石蜡制成的相变石蜡板为研究对象,采用现场连续对比测量的方法,研究了相变石蜡板在塑料大棚自然运行状态下的蓄放热调温性能及其对光照的影响,以期明确内置蓄热结构的被动热环境调控效果。结果表明:白天试验棚1~3室内平均温度较试验棚4降低,最高温差为3.08~3.74℃,夜晚试验棚1~3室内平均温度较试验棚4提高,有效升温3.90~4.38℃;同时试验棚1~3室内光照满足需求。典型天气条件下,试验棚1~3明显降低白天室内峰值温度,相比试验棚4最高降温4.8~13.3℃,夜晚相变石蜡板持续放热室内温度显著高于试验棚4,有效升温0.9~10.5℃,且综合来看18℃熔点石蜡蓄放热效果最佳;试验棚1~3室内光照条件存在差异,在晴天、多云和阴天时室内采光较好。

The phase change board containing paraffin made of transparent glass encapsulated phase change energy storage material paraffin was taken as the research object,the heat storage and temperature regulation performance of phase change board containing paraffin under the natural operation state of plastic greenhouse and its influence on light were studied by using the test method of on-site continuous comparative measurement,in order to clarify the passive thermal environment regulation effect of internal built-in heat storage structure.The experimental results showed that the indoor average temperature of experiment greenhouse 1-3 were lower than that of experiment greenhouse 4 during the daytime,and the maximum temperature difference were 3.08-3.74℃.At night,the indoor average temperature of experiment greenhouse 1-3 were higher than that of experiment greenhouse 4,and effectively increased the temperature by 3.90-4.38℃.At the same time,the indoor light of the experimental greenhouse 1-3 met the demand.Under typical weather conditions,the indoor peak temperature of experiment greenhouse 1-3 decreased significantly during the day,and the maximum temperature drop were 4.8-13.3℃with respect to experiment greenhouse 4.At night,phase change board containing paraffin continued to release heat,the indoor temperature of experiment greenhouse 1-3 were significantly higher than that of experiment greenhouse 4,and effectively increased the temperature by 0.9-10.5℃.In general,the paraffin with the point of 18℃had the best heat storage and release effect.The indoor light conditions of experiment greenhouse 1-3 existed differences,and the indoor light were better in sunny,cloudy and overcast sky days.